Mold and core



M. GUYOT MOLD AND CORE Sept. .10; 1929.

Original Filed Jan. 30, 1926 ZShefls-Sheet 1 INVENTOR %W AT RNEYS Sept.-10, 1929.

M. 'GUYOT MOLD AND CORE Original Filed Jan. 30, 1926 2 Sheets-Sheet 2INyENTOR 22 A ORNEYS Patented Sept. 10, 1929 16mm ST macros savor, orCLEVELAND, oH Io,

ATES

ASSIGNOR TO ALUMINUM COMPANY OF AMERICA, OF PITTSBURGH, PENNSYLVANIA, ACORPORATION OF PENNSYLVANIA.

MOLD AND' CORE.

applicatiou'filed January 30, 1926, Serial No. 84,846. Renewed July 1,1929.

This invention relates to multipart metal molds for casting high meltingpoint metals.

It also relates to metal molds for casting articles comprising-spaced,telescoping walls joined together by an end wall andby lateral- .websspaced apart from the end 'wall. It further relates to a permanent moldcast, aluminum alloy, cylinder head for an inso far as I am aware,although metals such as aluminum alloys possessed properties desir-ablefor such articles. Attempts to make such parts of aluminum'alloys bycasting in sand Orsemi-permanent molds have not been commercially,successful due, among other causes, to porosity in the castings throughwhich water used for cooling could enter the combustion chamber. By thisinvention, however, sound, non-porous, commercially satisfactorycylinder head castings can be made. Furthermore, this invention alsomakes possible the casting of hollow articles comprising telescopingspaced walls joined together by an end wall and by lateral webs spacedapart from the end wall.

In the drawings attached to and forming a part of this specification:

Fig. 1.- is a top plan view of an assembled.

mold embodying my invention;

Fig. 2 is a Ion 'tudinal view, partly in'elevation and part y insection, taken substantially on line 2-2 ofFig. 1;

Fig. 3 is a transversesectional view-taken on line 3.3of Fig. 1; I Fig.is a side elevation of a core embodying my invention and shown in Figs.1 to 3; Fig. 5 is a top plan view of the core with certain sectionsbeing removed; and

Figs. 6, 7 and 8am horizontal taken on lines 66, T-.7 and 88 of Fig. 4,

' respectively.

In the drawin s, 1 designatesa mold basemounted on the top' sur-' varepivoted together by an upright pin 3 extending into a perforation in thebase 1.

Two' other similarly shaped mold halves 4 sections are superposed on thefirst pair of mold halves and also pivoted together by the pin. Theinner or con'tacting'surfaces of the mold halves 2 are suitably recessedto form gate,

feeder and casting cavities 5, 6 and 7, respectively, therebetween, inwhich articles of the desired configuration may be cast. The mold halves2 are positioned, with respect to the. base, by a: pilot 8 projectingabove the t? surface of the base and seating in correspon mg recesses 8.in the mold'halves 2.. This p lot may be integral with the base but, asshown, is formed separately so that the same may be replaced by otherpilots wheneverit is desired to employ the base for making differentcastings. The top surface of the pilot may conveniently. serve as an endwall for the casting cavity, and may include-the use of an insert 9 ofspecial shape. The insert 9 shown consists of a member seated andsecurelylield inthe pilot and-having a top surface 9 shaped to form theend wall of the desired casting. The mold, herein shown,-is constructedto form an outstanding flange 10 on the endless attached to the moldhalves. The upper or superposed mold halves 4, which seat on the lowermold halves and filler plates have surfaces formed to. receive thefiller plates 12. It will be-understood that when the mold halves aremoved into engagement with each other they may be secured together attheir-free ends, as by the clamping bar 13 and hook 14;. A multipartcoreis carried by the superposed mold halves and clamped together andheld in position by the latter, when the clamping bar and book are inassembled position. This core projects into the casting cavity and formsinner walls therefor against which the molten metal may be cast. The

core shown herein consists of a central, cylindrical section 16 having areduced extension 17 at its free end, which projects into acorrespondingly shaped perforation in the member 9 carried by the pilot.Surrounding the central cylindrical section. 16 are disposed apluralityof outer sections engaging therewith and with each other andhaving freev ends which extend into the casting cavity but stop short ofthe member 9 and the pilot 8,

. and are spaced apart from the cylindrical section-and from the moldhalves; These outer core sections cooperate with each other to form anendless hollow tubular walli It will be understood that the centralsection need not necessarily be cylindrical nor extend into contact withthe bottom .wall of the casting cavity. It will also be understood thatthe outer core sections -may beshaped to provide walls which are notnecessarily endless or circular and that they. form tubular walls ofvariouscross sectional conlarge section 23. The small sections 22 whichare arranged in pairs are relatively narrow and have theirvmeeting faces22 cut away to form the cross webs 21 on the casting. Each section hasan outstanding flange 22 on its outer end to support the section fromthe top of the mold halves. The large section 23 is tubular in form withan outstanding flange 23 at its outer end to rest on the mold halves. Itis provided with grooves 23 to receive the pairs of smaller sections 22,

which grooves extend entirely through the section '23 near its lower end(see Fig. 6) thereby forming openings-through which en- 'largcd portionsof sections 22 project to form the outer wall for the part 18 of casting11. The free ends of all the sections 22; and 23 are preferably alignedas shown whenassembled with the mold.

For the purpose of'rendering easy the re moval of sections 22 from acasting, they are provided with draft so as to be separable from eachother in the casting. Although the amount of inclination of thesubstantially parallel outer and inner surfaces necessary for such draftmay be small, it has i been indicated as large in Fig. 6 for the sake ofclcarness. That figure shows the sections 22 each havin converginglyinclined outer and inner surfaces 22 and 22?, respectively,

below the web recess 22. Additional similar core parts 24 are disposedon opposite sides of the main core to form certain walls of the cavityin which the flange 10 is cast. Each part 24 seats in a see I suitablyshaped recess in the mold halves; and is provided at its outer end witha supportingflange 24 and a'handle 24?. Eachpart 24 partly supports theflanges .22". of a A core constructed as above descrrbed,'maypair ofsections 22.]

be easily removed from its casting by, first loosening the clamp. 13 onthe mold halves and then removing the central section 1.6.

Then-the larger outer section 23 caIibe-removed by lifting it verticallyout ofthe'casting, after which the pairs of narrow sections 22 may beremovedfby. pivoting each section about its inner corner 22 as ispermitted by the draft at the surfaces 22 and 22 and at the same timesliding the sections around the casting between the parallel walls untilthe sections clear the web 21, after which the sections are liftedvertically out of the'cast-r ing. Such movements free the sections 22'from the cross webs 21 and the end wall of the: casting, andpermit-their unobstructed removal from the casting. Then core parts 24:may be removed and vthe moldj halves moved apart to tree the casting. JIt will be understood by those skilledin the art, that thevarious-partsshown and described in detail hereinabove,- have been.given'for the purpose]; of enablingothers to,

practice my inventio'njand not for zthepu'rpose of limiting theinvention-thereto. -Va'-' rious changes, not amounting -toinvention',.

may accordingly be inade in theforegoing details without departing fromthe spirit of my invention. The scope of my invention is defined in whatis claimed.-

'W'hat-is claimed is: p p 1 1. A mold for casting a metal article whichcomprises a mold base, mold halves slidably. carried thereon and havingtheir adjacent inner faces suitably recessed to form gate, riser andcastingcavities for the said article, and a sectional metal coresupportedby the mold halves ,to project-into and form'inner .walls ofthe casting cavity, the said core including a plurality of sections toformthe space between. the said 7 inner and outer. walls of the casting,one of the said sections being. circular-and cut away to receive pairsof sections, and other sections being arranged in pairs and-disposed Ain the said circular section, each pair of sections being recessed toform therebetwe'en lateral webs connecting the innerand outer walls andspaced apart from. theend-wall'.

2. A mold for castin metals which comprises a mold base, mold halvesslidably car-' ried thereon and having their adjacent inner facessuitably recessed to form gate, riser and casting cavities for thearticle to' 'be cast, and a sectional metal core supported by-the moldhalves to project into and form inner walls of the casting cavity,the-said core including a plurality of cooperating sections forming anendless. wall spaced i said article,

core encompassed by said series of sections and spaced therefromthroughout part of its outer surface to form another part of the moldcavity.

In testimony whereof I hereunto aflix my signature this 23rd day ofJanuary, 1926.

MARIUS GUYOT.

-3. A moldfor casting metals which comprises a mold base, mold halvesslidably carried thereon and having their adjacent inner faces suitablyrecessed to form ate, riser and casting cavities for the art1cle to becast, and a sectional metal core supported by the mold halves to projectinto and form inner walls of the casting cavity, the said core includinga plurality of cooperating sections formin an endless wall spaced apartfrom the side and bottom walls of the casting cavity, the said sectionsconsisting of a section having wide, circumferent-ially extended,oppositely disposed free endportions, and narrow sections arranged inpairs engaging the side edges of the said ortions, each pair of sectionsbeing provlded with a recess therethrough at the parting line and remotefrom the free end thereof, and a central section withinthe endless wallforming sections and spaced apart from the free ends thereof.

4. A mold for casting a metal article which comprises a mold base, moldhalves slidably carried thereon and having their adjacent inner facessuitably recessed} to form gate, riser and casting cavities for the anda sectional metal core supported by the mold halves to project into andform inner walls of the casting cavity, the said coreincluding aplurality of sec tions to form the space between the said inner andouter walls of the casting, one of the said sections being circular andcut away to reciive pairs of sections, and other sections bei g arrangedin pairs and disposed in the said circular section, each pair ofsections being recessed to form therebetween lateral webs connecting theinner and outer walls and spaced apart from the end wall, each pair ofsectionshaving inner and outer casting engaging side surfaces in-'clined convergingly toward their meeting edges,

5. A mold for casting metals which comprises outer mold sections, aseries of core sections in contact with and supported by said moldsections, and an inner core encompassed and supported by said series ofsections.

6. A mold for casting metals which comprises outer mold sections, aseries of core sections in contact with said core sections throughoutpart of their outer surface and spaced therefrom for the remainderthereof to form part of a mold cavity, and an inner

